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The synthesis and secretion of the acute-phase protein C-reactive protein by rabbit primary hepatocyte cultures was investigated. Hepatocytes prepared from animals that had received inflammatory stimuli 18-24 h before cell isolation were found to incorporate radiolabelled amino acids into C-reactive protein throughout the 48 h culture period. Intracellular C-reactive protein was found to be in steady state and there was no significant degradation of extracellular C-reactive protein, permitting direct estimation of rate of synthesis from rate of extracellular accumulation. Both C-reactive protein and total secreted protein were synthesized at constant rates for at least 24 h in culture. Mean rate of accumulation of newly synthesized total proteins in medium of cultures from six stimulated animals was 40% greater than was found in cultures from nine control (unstimulated) animals; this difference did not achieve statistical significance (0.05 less than P less than 0.10). Mean rate of C-reactive-protein synthesis represented 3.9% of total secreted-protein synthesis in cultures prepared from stimulated animals compared with 0.3% in cultures from control animals (P less than 0.001). Further, there was a correlation between C-reactive-protein synthesis by cultured hepatocytes and serum C-reactive-protein concentration at time of hepatocyte isolation (P less than 0.001). Rates of C-reactive-protein synthesis by hepatocyte cultures from stimulated animals were in good agreement with those previously measured in isolated perfused livers and those calculated from results of studies in vivo.

Synthesis and secretion of C-reactive protein by rabbit primary hepatocyte cultures